The brick walls are there for a reason. The brick walls are not there to keep us out. The brick walls are there to give us a chance to show how badly we want something. Because the brick walls are there to stop the people who don't want it badly enough. They're there to stop the other people.
Security is mostly a superstition. It does not exist in nature, nor do the children of men as a whole experience it. Avoiding danger is no safer in the long run than outright exposure. Life is either a daring adventure, or nothing.
The greatest challenge a teacher has to accept is the courage to be; if we we make mistakes; we say too much where we should have said nothing; we do not speak where a word might have made all the difference. If we are, we will make terrible errors. But we still have to have the courage to struggle on, trusting in our own points of reference to show us the way.